Concealed dangerous articles detection method and device

An apparatus for implementing a method for detecting hidden hazardous substance comprising:

• a terahertz emitting device configured to produce wavelength tunable continuous wave terahertz radiation for irradiating the detected object and interacting with the object;
• a terahertz detector configured to receive terahertz radiation reflected back from the detected object;
• a terahertz optical assembly configured to collimate the wave beam produced by the terahertz emitting device, and focus it to the detected object, and meanwhile collect the terahertz wave beam reflected back from the detected object to the terahertz detector;
• a wave beam scanning control system configured to adjust the spatial position of the terahertz wave beam incident to the detected object;
• and
• a data acquisition and processing system connected to the terahertz emitting device, the terahertz detector and the wave beam scanning control system and configured to control coordination of the terahertz emitting device, the terahertz detector and the wave beam scanning control system in the apparatus, build a terahertz reflection image of the detected object, judge whether there is a suspicious area containing hazardous substance in the terahertz reflection image based on shape characteristics and gray-scale value characteristics obtained by the terahertz reflection image, searching and locating the suspicious area, then perform analysis and processing for the multi-wavelength reflection spectrum data of measurement points of interest in the suspicious area, and present hazardous substance identifying result.